Abstract
Compact convex cores with totally geodesic boundary are proven to uniquely minimize volume over all hyperbolic 3-manifolds in the same homotopy class. This solves a conjecture in Kleinian groups concerning acylindrical 3-manifolds. Closed hyperbolic manifolds are proven to uniquely minimize volume over all compact hyperbolic cone-manifolds in the same homotopy class with cone angles ≤2π . Closed hyperbolic manifolds are proven to minimize volume over all compact Alexandrov spaces with curvature bounded below by −1 in the same homotopy class. A version of the Besson–Courtois–Gallot theorem is proven for n -manifolds with boundary. The proofs extend the techniques of Besson–Courtois–Gallot.
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